It’s probably because of the swipe to go back. If the user pulls right from the left edge, even 1 pixel, it will start loading the previous view and closing the current. So if that view has any state events or is loading stuff it can mess things up.
Try adding
can-swipe-back="false"
on the Ion-view element and see if that helps it.
You can also re-create this by swiping back from the left side then go back left and don’t complete the swipe. If it breaks the app then that is the culprit.